<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-if</title>
    <!--  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>-->
    <script src="vue.js"></script>
</head>
<body>
<!-- view -->
<div id="app">
    <h1 v-if = "flag">根据 true or false 显示！</h1>
    <h3>显示文字，方便f12</h3>
</div>
<script>
    let vm = new Vue({
        el: "#app",
        //data指的是model
        data() {
            return {
                flag:false
            }
        }
    });
</script>
</body>
</html>
